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Piston for a two-stroke engine operating with advanced scavenging and a two-stroke engine

Active Publication Date: 2018-02-22
ANDREAS STIHL AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a two stroke engine piston with advanced scavenging properties that are stable and have high strength. The piston has a connecting rib that improves the stability and support of the piston pin eye, and also facilitates heat dissipation and cooling of the piston. The piston pin receptacle is positioned in the piston pocket, which reduces the input of heat into the piston pin and improves engine performance. The piston is made of light metal, such as aluminum or magnesium, which results in a reduction in weight and allows for higher engine displacement and performance.

Problems solved by technology

Sufficient installation space remains for the piston pocket as a result, without the overall height of the piston being increased.

Method used

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  • Piston for a two-stroke engine operating with advanced scavenging and a two-stroke engine
  • Piston for a two-stroke engine operating with advanced scavenging and a two-stroke engine
  • Piston for a two-stroke engine operating with advanced scavenging and a two-stroke engine

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Embodiment Construction

[0028]FIG. 1 diagrammatically shows one embodiment for a two stroke engine 1. The two stroke engine 1 is configured as a single cylinder engine and has a cylinder 2, in which a combustion chamber 3 is configured. The cylinder 2 has a cylinder longitudinal axis 48. The combustion chamber 3 is delimited by a piston 5 which is mounted so as to move to and fro in a cylinder bore 15 of the cylinder 2 in the direction of the cylinder longitudinal axis 48, in the direction of which the piston 5 moves during operation. FIG. 1 shows the piston 5 at its bottom dead center. The piston 5 drives a crankshaft 7 via a connecting rod 6. The crankshaft 7 is mounted in a crankcase interior 16 of a crankcase 4 such that it can be rotated about a rotational axis 8. During operation, the crankshaft 7 rotates in a rotational direction 69. The two stroke engine 1 can be, for example, the drive motor in a handheld work apparatus, such as a power saw, an angle grinder, a blower device or the like. The crank...

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Abstract

A piston for a two stroke engine which operates with advanced scavenging has a piston base and a piston skirt. The center axis of the piston skirt forms a longitudinal center axis of the piston. The piston has two piston pin eyes, in which piston pin receptacles are configured. The center axis of the piston pin receptacles forms a transverse axis of the piston. The piston has at least one piston pocket. At least one piston pin eye is connected via at least one connecting rib to the piston skirt. Here, the connecting rib runs on that side of the piston pocket which faces away from the piston base.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority of European patent application no. 16 001 824.8, filed Aug. 19, 2016, the entire content of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The invention relates to a piston for a two stroke engine of the stated type which operates with advanced scavenging, and to a two stroke engine.BACKGROUND OF THE INVENTION[0003]U.S. Pat. No. 8,899,194 has disclosed a piston for a two stroke engine which operates with advanced scavenging, which piston has piston pockets which serve to connect an air inlet which opens at the cylinder bore to transfer windows of transfer channels. Air from the air inlet is advanced in the transfer channels via the piston pockets. A multiplicity of deepenings are provided on the piston skirt of the piston.SUMMARY OF THE INVENTION[0004]It is an object of the invention to provide a piston for a two stroke engine which operates with advanced scavenging, which piston has ...

Claims

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Application Information

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IPC IPC(8): F02F3/24F02F3/00
CPCF02F3/0076F02F3/24F02B75/02F02B2075/025F02F3/0084
Inventor LOEW, BIRGERLANK, JONAS
Owner ANDREAS STIHL AG & CO KG
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